Java – number of bundles in Android
Pass data from one activity to another through the following code:
@Override
public void execute(List<Report> reports,Questions question) {
Intent replyIntent = new Intent(listener,ReplyActivity.class);
replyIntent.putExtra("id",0L);
replyIntent.putExtra("questions",question);
listener.openReportOk(question);
listener.startActivity(replyIntent);
}
Listen for activity references whose callbacks are
The problem is this class:
@Table(name = "Questions")
public class Questions extends Entity implements Parcelable {
public static final Creator<Questions> CREATOR = new Creator<Questions>() {
public Questions createFromParcel(Parcel source) {
return new Questions(source);
}
public Questions[] newArray(int size) {
return new Questions[size];
}
};
@TableField(name = "idReport",datatype = DATATYPE_INTEGER)
private int idReport;
@TableField(name = "nameReport",datatype = DATATYPE_STRING)
private String nameReport;
@TableField(name = "replyGroups",datatype = DATATYPE_STRING)
private String replyGroups;
@TableField(name = "questionGroups",datatype = DATATYPE_ENTITY)
private List<QuestionsGroup> questionsGroup;
private Boolean canCreateNew;
public Questions(int idReport,String nameReport,String replyGroups,List<QuestionsGroup> questionsGroup) {
this.idReport = idReport;
this.nameReport = nameReport;
this.replyGroups = replyGroups;
this.questionsGroup = questionsGroup;
this.canCreateNew = false;
}
public Questions() {
questionsGroup = new ArrayList<QuestionsGroup>();
}
private Questions(Parcel in) {
this();
this.idReport = in.readInt();
this.nameReport = in.readString();
this.replyGroups = in.readString();
Bundle b = in.readBundle(QuestionsGroup.class.getClassLoader());
this.questionsGroup = b.getParcelableArrayList("questionGroups");
this.canCreateNew = (Boolean) in.readValue(Boolean.class.getClassLoader());
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest,int flags) {
dest.writeInt(this.idReport);
dest.writeString(this.nameReport);
dest.writeString(this.replyGroups);
Bundle b = new Bundle();
b.putParcelableArrayList("questionGroups",(ArrayList<QuestionsGroup>) this.questionsGroup);
dest.writeBundle(b);
dest.writeValue(this.canCreateNew);
}
}
When I receive a package in the oncreate method:
private void getData(Intent data) {
ID = data.getExtras().getLong("id");
questions = data.getExtras().getParcelable("questions");
}
I get this error:
10-05 13:19:15.508 3499-3499/com.firext.android E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.firext.android,PID: 3499
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.firext.android/com.firext.android.activities.reply.ReplyActivity}: java.lang.IllegalStateException: Bad magic number for Bundle: 0x28
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2255)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2317)
at android.app.ActivityThread.access$800(ActivityThread.java:143)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1258)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5070)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)
Caused by: java.lang.IllegalStateException: Bad magic number for Bundle: 0x28
at android.os.BaseBundle.readFromParcelInner(BaseBundle.java:1342)
at android.os.BaseBundle.<init>(BaseBundle.java:90)
at android.os.Bundle.<init>(Bundle.java:66)
at android.os.Parcel.readBundle(Parcel.java:1645)
at com.firext.android.domain.QuestionsGroup.<init>(QuestionsGroup.java:53)
at com.firext.android.domain.QuestionsGroup$1.createFromParcel(QuestionsGroup.java:25)
at com.firext.android.domain.QuestionsGroup$1.createFromParcel(QuestionsGroup.java:23)
at android.os.Parcel.readParcelable(Parcel.java:2160)
at android.os.Parcel.readValue(Parcel.java:2066)
at android.os.Parcel.readListInternal(Parcel.java:2422)
at android.os.Parcel.readArrayList(Parcel.java:1756)
at android.os.Parcel.readValue(Parcel.java:2087)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2393)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.Bundle.getParcelableArrayList(Bundle.java:782)
at com.firext.android.domain.Questions.<init>(Questions.java:58)
at com.firext.android.domain.Questions.<init>(Questions.java:18)
at com.firext.android.domain.Questions$1.createFromParcel(Questions.java:22)
at com.firext.android.domain.Questions$1.createFromParcel(Questions.java:20)
at android.os.Parcel.readParcelable(Parcel.java:2160)
at android.os.Parcel.readValue(Parcel.java:2066)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2393)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.Bundle.getParcelable(Bundle.java:738)
at com.firext.android.activities.reply.ReplyActivity.getData(ReplyActivity.java:72)
at com.firext.android.activities.reply.ReplyActivity.onCreate(ReplyActivity.java:38)
at android.app.Activity.performCreate(Activity.java:5720)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1102)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2208)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2317)
at android.app.ActivityThread.access$800(ActivityThread.java:143)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1258)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5070)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)
What's up?
Solution
outline
It seems that you have an error. How do you store & retrieve the mixed information of the problem group Line 53 is a line to note
When writing a package, Android stores a special "magic number" in each field to ensure that the correct order is used when pulling the fields out of the package (see the detailed description of number definition)
You received an error because the magic number was not found in the expected location – this is because you did not remove the fields from the package in the correct order
Detailed explanation of the official source code
[the following explanation is based on the bundle and basebundle classes implemented by the "latest" (at the time of writing this article) api21. You can find the complete code here:
> BaseBundle on android. googlesource. com
You can also use the Android SDK manager to install a local copy of the code on the development machine, which I find very useful.]
So
When a package is written, Android takes some security measures to ensure that these fields will be arranged when trying to keep it separate To do this, Android attaches a field to the magic number, which is defined as:
static final int BUNDLE_MAGIC = 0x4C444E42; // 'B' 'N' 'D' 'L'
You can see this in the code for writetoparcelinner() (summarized below)
void writeToParcelInner(Parcel parcel,int flags) {
if (mParcelledData != null) {
if (mParcelledData == EMPTY_PARCEL) {
parcel.writeInt(0);
} else {
int length = mParcelledData.dataSize();
parcel.writeInt(length);
parcel.writeInt(BUNDLE_MAGIC);
parcel.appendFrom(mParcelledData,length);
}
} else {
.......... extra code chopped out for illustration purposes
}
}
Similarly, when reading from a package, Android checks the bundle before returning the value in the package_ Magic number
private void readFromParcelInner(Parcel parcel,int length) {
if (length == 0) {
// Empty Bundle or end of data.
mParcelledData = EMPTY_PARCEL;
return;
}
int magic = parcel.readInt();
if (magic != BUNDLE_MAGIC) {
//noinspection ThrowableInstanceNeverThrown
throw new IllegalStateException("Bad magic number for Bundle: 0x"
+ Integer.toHexString(magic));
}
.......... extra code chopped out for illustration purposes
}
In the above code for api21 baseline, you can see the error thrown on line 1342 according to the logcat trace
Solution: further debugging
The original poster pointed out that questions group was properly packaged
One way to further debug this problem is to stay away from the (current) new api21 that introduces the basebundle class; For example, use only api19 of the bundle class
If the user's code is actually correct, it is more likely to run on a more mature API
If the code is still broken, it may be the questionsgroup code However, in addition, the new logcat trace will point to different parts of the code, which can be viewed and may provide more insight into the problem
Except for the bundle, the method readfromparcellinner() in line 1730 means the same problem:
int magic = parcel.readInt();
if (magic != BUNDLE_MAGIC) {
//noinspection ThrowableInstanceNeverThrown
throw new IllegalStateException("Bad magic number for Bundle: 0x"
+ Integer.toHexString(magic));
}
Related articles
For relevant information, please refer to the following post:
> Android parcelable and Intent: redBundle: bad magic number